The main reason I don't see double being an issue is because I'd never have it turned on for more than a month at a time. You can easily bring a 5 box team 1-70 in 30 days even without RAF type XP, so dropping an extra $100 on subs for a month would be all it takes to get 2-3 teams to 70 if you focus. HOnestly I've got enough 60+ toons to last me forever now, hell I haven't even finished gearing out my shamans and I've got plans to do druids, locks, and a pally/mage/priest/rogue/warrior group.